This game has a neat idea, but it suffers from needing some tune-ups desperately: Enemies shoot so fast and your shield depletes so quickly the game is just about awkwardly spamming spacebar in circles around enemies then moving in and doing a few points of damage before you return to the cat and mouse chase; making each wave feel like it takes forever. Having slower bullets but ones that can go in more elaborate patterns, and less enemy HP would do a lot to improve the feel of the game and also allow for a better escalation in difficulty as the waves go on. Cool concept, though!